Stamping base



Patented Nov. 25, 1941 l A I UNITED STATES PATENT OFFICE STAMPING BASEPaulHalbig and Bruno von Zychlinski, Munich,

Germany, assignors to Consortium for Elektrochemische Industrie G. in.b. H., Munich, Germany, a corporation of Germany No Drawing. ApplicationDecember 3, 1938, Se-

rial No. 243,898. In Germany December 7,

3 Claims. (oi. 1s4 5s) This invention has for its object to provide aThe easy manipulation of our new stampin new d p ed Sta ping base or diecounter. bases allows of a particularly advantageous ar- These bases areused as clicker die blocks and rangement of the plant. The preparationof the analogous uses in which material is placed on bases, also therenewal of usedba esc m y said base and a die cuts out a piece therefromreadily effected, since the material may be mouldand impinges upon thesaid base. ed by a pressing process in a simple manner.

For stamping out moulded parts of material The material to be pressedconsists of polysuch as paper, leather, and other materials cavinylalcohol with a suitable water content for pa'ble of being stamped,stamping bases are used, the moulding. Also otherplastifying materialswhich for the most part consist of wood, but for in for the polyvinylalcohol or its derivatives, such p l P rp ses may also consis o p p;leather as are well known and disclosed in Patents and similarsubstances. These stamping bases 2,072,302 and 2,146,873, and fillerssuch as are commonly possess the following disadvantages: well known anddisclosed in Patents 1,672,157 and They become so worn after onlyalimited period 2,1273%, etc.,.may be added. Moreover, by the of use,that, in the case of wooden bases, they addition or use of itsderivatives e. g. the'esters must be fitted afresh, or if they consistof leather or acetals or ester acetals polyvinyl alcohol may or pulp,they must be changed. be adapted to special requirements.

Moreover, the above stamping bases wear the A stamping test which wascarried out to destamping tools (knives, pipes and mould gauges) terminethe yield capacity of the new bases, for v ry o sid a y wh l ads t a idunting example after 50,000 stampings still showed good of the tools.Since wood is a natural material utility of the tool and base and wasstoppedonly of y y g h s ard and Soft years) because the order for theseparticular stampings sensitive stamping tools are often cracked by wascompleted. Here chrome leather belts were wooden bases, a fault whichalso occurs to an stamped out with abelt knife which was equipped evengreater extent in bases made of pulp. Furwith a cutting knife and tentubes- To obtain ther, the cut of the stamped out piece ceases to thesame work output with stamping bases of the be sharp even when the basehas only worn a usual wood, repeated changes of knife and base little,and in the case of a soft stamping material were necessary.

such as textile, it loses the capacity of retaining The inventionclaimed is:

.its size. 1. A stamping base for supporting sheet ma- We have foundthat stamping'bases which conterialor the like containing, as theprincipal intain polyvinyl alcohol or its partially saponified gredient,a material selected from the group con- I esters and acetals, offerspecial advantages. sisting of polyvinyl alcohol, and esters and acetalsThese advantages are displayed in a striking of polyvinyl alcohol.

manner, e. g. in the longlife of the stamping 2. A stamping base forsupporting sheet mabases, in the saving of stamping tools, in the terialor the-like containing, as the principal neater and sharper stampingwork, even after a ingredient, partially esteriiled polyvinyl alcohol.

long period of use, and in the handiness of the 3. A stamping base forsupporting sheet ma bases. The stamping out process is thus conterial orthe like containing, as the principal insiderably improved qualitativelyand economical-' gredient, partially acetalised polyvinyl alcohol: 131by the use of this stamping base, with regard PAUL HAL-BIG.-

to the stamping out tools. BRUNO v. ZYCHLINSKI.

